Subsections

- Library
- Description
- Dialog Box
- Default properties
- Interfacing function
- Computational function (type 4)

##
Absolute value

### Library

Non_linear

### Description

The Abs block outputs the absolute value of the input.

### Dialog Box

Set block parameters |
use zero_crossing (1: yes) (0:no) | 1

- use zero_crossing : Select to enable zero crossing detection.

### Default properties

- always active: no
- direct-feedthrough: yes
- zero-crossing: yes
- mode: yes
- number/sizes of inputs: 1 / -1
- number/sizes of outputs: 1 / -1
- number/sizes of activation inputs: 0 /
- number/sizes of activation outputs: 0 /
- continuous-time state: no
- discrete-time state: no
- name of computational function: absolute_value

### Interfacing function

`scilab/macros/scicos_blocks/nonlinear/ABS_VALUE.sci`

### Computational function (type 4)

    #include "scicos_block.h"
    #include <math.h>
    #include "../machine.h"

    void  absolute_value(scicos_block *block,int flag)
    {
      int i,j;
      if (flag==1){
        if( block->ng>0){
          for(i=0;i<block->insz[0];++i){
    	if (get_phase_simulation()==1) {
    	  if (block->inptr[0][i]<0){
    	    j=2;
    	  } else{
    	    j=1;
    	  }
    	}else {
    	  j=block->mode[i];
    	}
    	if (j==1){
    	  block->outptr[0][i]=block->inptr[0][i];
    	} else{
    	  block->outptr[0][i]=-block->inptr[0][i];
    	}
          }
        }else{
          for(i=0;i<block->insz[0];++i){
    	if (block->inptr[0][i]<0){
    	  block->outptr[0][i]=-block->inptr[0][i];
    	}else{
    	  block->outptr[0][i]=block->inptr[0][i];
    	}
          }
        }
      }else if (flag==9){
        for(i=0;i<block->insz[0];++i){
          block->g[i]=block->inptr[0][i];
          if (get_phase_simulation()==1) {
    	if(block->g[i]<0){
    	  block->mode[i]=2;
    	}else{
    	  block->mode[i]=1;
    	}
          }
        }
      }
    }